Add emergency_withdraw for events

[Akshola00]

Description

Allow platform admin to drain event funds in case of critical bugs.

Testing Requirements

Test admin auth and emergency bypass.

• Crucial: Ensure all standard GitHub CI checks pass before submitting your PR!

Links

• See contributor.md for guidelines.

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[Mmesolove]

@Mmesolove has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I would love to work on this issue.

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Congratulations, @Mmesolove! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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